I apologize if I caused you stress, that is not my intention. I understand you don't like what I have to say, but this is an important conversation and anyone putting forth advice like this should welcome questions and challenges like this. Do you want to follow a method that cannot withstand scrutiny?I’m not going to engage with this sort of thing beyond this response, b/c your approach here really comes across as seeking to battle.
I would love to see someone or some organization with the means to really test the veracity of these claims, my personal opinion is that we wouldn't get an answer that says we don't need to QT, but we might get more insight into ways to increase the immune response for fish to make them healthier.